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  <h1>Source code for torchvision.datasets.cityscapes</h1><div class="highlight"><pre>
<span></span><span class="kn">import</span> <span class="nn">json</span>
<span class="kn">import</span> <span class="nn">os</span>
<span class="kn">from</span> <span class="nn">collections</span> <span class="kn">import</span> <span class="n">namedtuple</span>
<span class="kn">import</span> <span class="nn">zipfile</span>

<span class="kn">from</span> <span class="nn">.utils</span> <span class="kn">import</span> <span class="n">extract_archive</span><span class="p">,</span> <span class="n">verify_str_arg</span><span class="p">,</span> <span class="n">iterable_to_str</span>
<span class="kn">from</span> <span class="nn">.vision</span> <span class="kn">import</span> <span class="n">VisionDataset</span>
<span class="kn">from</span> <span class="nn">PIL</span> <span class="kn">import</span> <span class="n">Image</span>


<div class="viewcode-block" id="Cityscapes"><a class="viewcode-back" href="../../../datasets.html#torchvision.datasets.Cityscapes">[docs]</a><span class="k">class</span> <span class="nc">Cityscapes</span><span class="p">(</span><span class="n">VisionDataset</span><span class="p">):</span>
    <span class="sd">&quot;&quot;&quot;`Cityscapes &lt;http://www.cityscapes-dataset.com/&gt;`_ Dataset.</span>

<span class="sd">    Args:</span>
<span class="sd">        root (string): Root directory of dataset where directory ``leftImg8bit``</span>
<span class="sd">            and ``gtFine`` or ``gtCoarse`` are located.</span>
<span class="sd">        split (string, optional): The image split to use, ``train``, ``test`` or ``val`` if mode=&quot;fine&quot;</span>
<span class="sd">            otherwise ``train``, ``train_extra`` or ``val``</span>
<span class="sd">        mode (string, optional): The quality mode to use, ``fine`` or ``coarse``</span>
<span class="sd">        target_type (string or list, optional): Type of target to use, ``instance``, ``semantic``, ``polygon``</span>
<span class="sd">            or ``color``. Can also be a list to output a tuple with all specified target types.</span>
<span class="sd">        transform (callable, optional): A function/transform that takes in a PIL image</span>
<span class="sd">            and returns a transformed version. E.g, ``transforms.RandomCrop``</span>
<span class="sd">        target_transform (callable, optional): A function/transform that takes in the</span>
<span class="sd">            target and transforms it.</span>
<span class="sd">        transforms (callable, optional): A function/transform that takes input sample and its target as entry</span>
<span class="sd">            and returns a transformed version.</span>

<span class="sd">    Examples:</span>

<span class="sd">        Get semantic segmentation target</span>

<span class="sd">        .. code-block:: python</span>

<span class="sd">            dataset = Cityscapes(&#39;./data/cityscapes&#39;, split=&#39;train&#39;, mode=&#39;fine&#39;,</span>
<span class="sd">                                 target_type=&#39;semantic&#39;)</span>

<span class="sd">            img, smnt = dataset[0]</span>

<span class="sd">        Get multiple targets</span>

<span class="sd">        .. code-block:: python</span>

<span class="sd">            dataset = Cityscapes(&#39;./data/cityscapes&#39;, split=&#39;train&#39;, mode=&#39;fine&#39;,</span>
<span class="sd">                                 target_type=[&#39;instance&#39;, &#39;color&#39;, &#39;polygon&#39;])</span>

<span class="sd">            img, (inst, col, poly) = dataset[0]</span>

<span class="sd">        Validate on the &quot;coarse&quot; set</span>

<span class="sd">        .. code-block:: python</span>

<span class="sd">            dataset = Cityscapes(&#39;./data/cityscapes&#39;, split=&#39;val&#39;, mode=&#39;coarse&#39;,</span>
<span class="sd">                                 target_type=&#39;semantic&#39;)</span>

<span class="sd">            img, smnt = dataset[0]</span>
<span class="sd">    &quot;&quot;&quot;</span>

    <span class="c1"># Based on https://github.com/mcordts/cityscapesScripts</span>
    <span class="n">CityscapesClass</span> <span class="o">=</span> <span class="n">namedtuple</span><span class="p">(</span><span class="s1">&#39;CityscapesClass&#39;</span><span class="p">,</span> <span class="p">[</span><span class="s1">&#39;name&#39;</span><span class="p">,</span> <span class="s1">&#39;id&#39;</span><span class="p">,</span> <span class="s1">&#39;train_id&#39;</span><span class="p">,</span> <span class="s1">&#39;category&#39;</span><span class="p">,</span> <span class="s1">&#39;category_id&#39;</span><span class="p">,</span>
                                                     <span class="s1">&#39;has_instances&#39;</span><span class="p">,</span> <span class="s1">&#39;ignore_in_eval&#39;</span><span class="p">,</span> <span class="s1">&#39;color&#39;</span><span class="p">])</span>

    <span class="n">classes</span> <span class="o">=</span> <span class="p">[</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;unlabeled&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;void&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;ego vehicle&#39;</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;void&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;rectification border&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;void&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;out of roi&#39;</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;void&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;static&#39;</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;void&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;dynamic&#39;</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;void&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">111</span><span class="p">,</span> <span class="mi">74</span><span class="p">,</span> <span class="mi">0</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;ground&#39;</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;void&#39;</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">81</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">81</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;road&#39;</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="s1">&#39;flat&#39;</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">128</span><span class="p">,</span> <span class="mi">64</span><span class="p">,</span> <span class="mi">128</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;sidewalk&#39;</span><span class="p">,</span> <span class="mi">8</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;flat&#39;</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">244</span><span class="p">,</span> <span class="mi">35</span><span class="p">,</span> <span class="mi">232</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;parking&#39;</span><span class="p">,</span> <span class="mi">9</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;flat&#39;</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">250</span><span class="p">,</span> <span class="mi">170</span><span class="p">,</span> <span class="mi">160</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;rail track&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;flat&#39;</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">230</span><span class="p">,</span> <span class="mi">150</span><span class="p">,</span> <span class="mi">140</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;building&#39;</span><span class="p">,</span> <span class="mi">11</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="s1">&#39;construction&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">70</span><span class="p">,</span> <span class="mi">70</span><span class="p">,</span> <span class="mi">70</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;wall&#39;</span><span class="p">,</span> <span class="mi">12</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="s1">&#39;construction&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">102</span><span class="p">,</span> <span class="mi">102</span><span class="p">,</span> <span class="mi">156</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;fence&#39;</span><span class="p">,</span> <span class="mi">13</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="s1">&#39;construction&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">190</span><span class="p">,</span> <span class="mi">153</span><span class="p">,</span> <span class="mi">153</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;guard rail&#39;</span><span class="p">,</span> <span class="mi">14</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;construction&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">180</span><span class="p">,</span> <span class="mi">165</span><span class="p">,</span> <span class="mi">180</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;bridge&#39;</span><span class="p">,</span> <span class="mi">15</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;construction&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">150</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;tunnel&#39;</span><span class="p">,</span> <span class="mi">16</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;construction&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">150</span><span class="p">,</span> <span class="mi">120</span><span class="p">,</span> <span class="mi">90</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;pole&#39;</span><span class="p">,</span> <span class="mi">17</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="s1">&#39;object&#39;</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">153</span><span class="p">,</span> <span class="mi">153</span><span class="p">,</span> <span class="mi">153</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;polegroup&#39;</span><span class="p">,</span> <span class="mi">18</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;object&#39;</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">153</span><span class="p">,</span> <span class="mi">153</span><span class="p">,</span> <span class="mi">153</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;traffic light&#39;</span><span class="p">,</span> <span class="mi">19</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="s1">&#39;object&#39;</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">250</span><span class="p">,</span> <span class="mi">170</span><span class="p">,</span> <span class="mi">30</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;traffic sign&#39;</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="s1">&#39;object&#39;</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">220</span><span class="p">,</span> <span class="mi">220</span><span class="p">,</span> <span class="mi">0</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;vegetation&#39;</span><span class="p">,</span> <span class="mi">21</span><span class="p">,</span> <span class="mi">8</span><span class="p">,</span> <span class="s1">&#39;nature&#39;</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">107</span><span class="p">,</span> <span class="mi">142</span><span class="p">,</span> <span class="mi">35</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;terrain&#39;</span><span class="p">,</span> <span class="mi">22</span><span class="p">,</span> <span class="mi">9</span><span class="p">,</span> <span class="s1">&#39;nature&#39;</span><span class="p">,</span> <span class="mi">4</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">152</span><span class="p">,</span> <span class="mi">251</span><span class="p">,</span> <span class="mi">152</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;sky&#39;</span><span class="p">,</span> <span class="mi">23</span><span class="p">,</span> <span class="mi">10</span><span class="p">,</span> <span class="s1">&#39;sky&#39;</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">70</span><span class="p">,</span> <span class="mi">130</span><span class="p">,</span> <span class="mi">180</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;person&#39;</span><span class="p">,</span> <span class="mi">24</span><span class="p">,</span> <span class="mi">11</span><span class="p">,</span> <span class="s1">&#39;human&#39;</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">220</span><span class="p">,</span> <span class="mi">20</span><span class="p">,</span> <span class="mi">60</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;rider&#39;</span><span class="p">,</span> <span class="mi">25</span><span class="p">,</span> <span class="mi">12</span><span class="p">,</span> <span class="s1">&#39;human&#39;</span><span class="p">,</span> <span class="mi">6</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">255</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;car&#39;</span><span class="p">,</span> <span class="mi">26</span><span class="p">,</span> <span class="mi">13</span><span class="p">,</span> <span class="s1">&#39;vehicle&#39;</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">142</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;truck&#39;</span><span class="p">,</span> <span class="mi">27</span><span class="p">,</span> <span class="mi">14</span><span class="p">,</span> <span class="s1">&#39;vehicle&#39;</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">70</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;bus&#39;</span><span class="p">,</span> <span class="mi">28</span><span class="p">,</span> <span class="mi">15</span><span class="p">,</span> <span class="s1">&#39;vehicle&#39;</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">60</span><span class="p">,</span> <span class="mi">100</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;caravan&#39;</span><span class="p">,</span> <span class="mi">29</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;vehicle&#39;</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">90</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;trailer&#39;</span><span class="p">,</span> <span class="mi">30</span><span class="p">,</span> <span class="mi">255</span><span class="p">,</span> <span class="s1">&#39;vehicle&#39;</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">110</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;train&#39;</span><span class="p">,</span> <span class="mi">31</span><span class="p">,</span> <span class="mi">16</span><span class="p">,</span> <span class="s1">&#39;vehicle&#39;</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">80</span><span class="p">,</span> <span class="mi">100</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;motorcycle&#39;</span><span class="p">,</span> <span class="mi">32</span><span class="p">,</span> <span class="mi">17</span><span class="p">,</span> <span class="s1">&#39;vehicle&#39;</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">230</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;bicycle&#39;</span><span class="p">,</span> <span class="mi">33</span><span class="p">,</span> <span class="mi">18</span><span class="p">,</span> <span class="s1">&#39;vehicle&#39;</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="p">(</span><span class="mi">119</span><span class="p">,</span> <span class="mi">11</span><span class="p">,</span> <span class="mi">32</span><span class="p">)),</span>
        <span class="n">CityscapesClass</span><span class="p">(</span><span class="s1">&#39;license plate&#39;</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">,</span> <span class="s1">&#39;vehicle&#39;</span><span class="p">,</span> <span class="mi">7</span><span class="p">,</span> <span class="kc">False</span><span class="p">,</span> <span class="kc">True</span><span class="p">,</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">142</span><span class="p">)),</span>
    <span class="p">]</span>

    <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">root</span><span class="p">,</span> <span class="n">split</span><span class="o">=</span><span class="s1">&#39;train&#39;</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="s1">&#39;fine&#39;</span><span class="p">,</span> <span class="n">target_type</span><span class="o">=</span><span class="s1">&#39;instance&#39;</span><span class="p">,</span>
                 <span class="n">transform</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">target_transform</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">transforms</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
        <span class="nb">super</span><span class="p">(</span><span class="n">Cityscapes</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">root</span><span class="p">,</span> <span class="n">transforms</span><span class="p">,</span> <span class="n">transform</span><span class="p">,</span> <span class="n">target_transform</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">mode</span> <span class="o">=</span> <span class="s1">&#39;gtFine&#39;</span> <span class="k">if</span> <span class="n">mode</span> <span class="o">==</span> <span class="s1">&#39;fine&#39;</span> <span class="k">else</span> <span class="s1">&#39;gtCoarse&#39;</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">images_dir</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="s1">&#39;leftImg8bit&#39;</span><span class="p">,</span> <span class="n">split</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">targets_dir</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="p">,</span> <span class="n">split</span><span class="p">)</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">target_type</span> <span class="o">=</span> <span class="n">target_type</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">split</span> <span class="o">=</span> <span class="n">split</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">images</span> <span class="o">=</span> <span class="p">[]</span>
        <span class="bp">self</span><span class="o">.</span><span class="n">targets</span> <span class="o">=</span> <span class="p">[]</span>

        <span class="n">verify_str_arg</span><span class="p">(</span><span class="n">mode</span><span class="p">,</span> <span class="s2">&quot;mode&quot;</span><span class="p">,</span> <span class="p">(</span><span class="s2">&quot;fine&quot;</span><span class="p">,</span> <span class="s2">&quot;coarse&quot;</span><span class="p">))</span>
        <span class="k">if</span> <span class="n">mode</span> <span class="o">==</span> <span class="s2">&quot;fine&quot;</span><span class="p">:</span>
            <span class="n">valid_modes</span> <span class="o">=</span> <span class="p">(</span><span class="s2">&quot;train&quot;</span><span class="p">,</span> <span class="s2">&quot;test&quot;</span><span class="p">,</span> <span class="s2">&quot;val&quot;</span><span class="p">)</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="n">valid_modes</span> <span class="o">=</span> <span class="p">(</span><span class="s2">&quot;train&quot;</span><span class="p">,</span> <span class="s2">&quot;train_extra&quot;</span><span class="p">,</span> <span class="s2">&quot;val&quot;</span><span class="p">)</span>
        <span class="n">msg</span> <span class="o">=</span> <span class="p">(</span><span class="s2">&quot;Unknown value &#39;</span><span class="si">{}</span><span class="s2">&#39; for argument split if mode is &#39;</span><span class="si">{}</span><span class="s2">&#39;. &quot;</span>
               <span class="s2">&quot;Valid values are {{</span><span class="si">{}</span><span class="s2">}}.&quot;</span><span class="p">)</span>
        <span class="n">msg</span> <span class="o">=</span> <span class="n">msg</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">split</span><span class="p">,</span> <span class="n">mode</span><span class="p">,</span> <span class="n">iterable_to_str</span><span class="p">(</span><span class="n">valid_modes</span><span class="p">))</span>
        <span class="n">verify_str_arg</span><span class="p">(</span><span class="n">split</span><span class="p">,</span> <span class="s2">&quot;split&quot;</span><span class="p">,</span> <span class="n">valid_modes</span><span class="p">,</span> <span class="n">msg</span><span class="p">)</span>

        <span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">target_type</span><span class="p">,</span> <span class="nb">list</span><span class="p">):</span>
            <span class="bp">self</span><span class="o">.</span><span class="n">target_type</span> <span class="o">=</span> <span class="p">[</span><span class="n">target_type</span><span class="p">]</span>
        <span class="p">[</span><span class="n">verify_str_arg</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="s2">&quot;target_type&quot;</span><span class="p">,</span>
                        <span class="p">(</span><span class="s2">&quot;instance&quot;</span><span class="p">,</span> <span class="s2">&quot;semantic&quot;</span><span class="p">,</span> <span class="s2">&quot;polygon&quot;</span><span class="p">,</span> <span class="s2">&quot;color&quot;</span><span class="p">))</span>
         <span class="k">for</span> <span class="n">value</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">target_type</span><span class="p">]</span>

        <span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">images_dir</span><span class="p">)</span> <span class="ow">or</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isdir</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">targets_dir</span><span class="p">):</span>

            <span class="k">if</span> <span class="n">split</span> <span class="o">==</span> <span class="s1">&#39;train_extra&#39;</span><span class="p">:</span>
                <span class="n">image_dir_zip</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="s1">&#39;leftImg8bit</span><span class="si">{}</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s1">&#39;_trainextra.zip&#39;</span><span class="p">))</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">image_dir_zip</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="s1">&#39;leftImg8bit</span><span class="si">{}</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s1">&#39;_trainvaltest.zip&#39;</span><span class="p">))</span>

            <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">mode</span> <span class="o">==</span> <span class="s1">&#39;gtFine&#39;</span><span class="p">:</span>
                <span class="n">target_dir_zip</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="s1">&#39;</span><span class="si">{}{}</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="p">,</span> <span class="s1">&#39;_trainvaltest.zip&#39;</span><span class="p">))</span>
            <span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">mode</span> <span class="o">==</span> <span class="s1">&#39;gtCoarse&#39;</span><span class="p">:</span>
                <span class="n">target_dir_zip</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">,</span> <span class="s1">&#39;</span><span class="si">{}{}</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="p">,</span> <span class="s1">&#39;.zip&#39;</span><span class="p">))</span>

            <span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="n">image_dir_zip</span><span class="p">)</span> <span class="ow">and</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="n">target_dir_zip</span><span class="p">):</span>
                <span class="n">extract_archive</span><span class="p">(</span><span class="n">from_path</span><span class="o">=</span><span class="n">image_dir_zip</span><span class="p">,</span> <span class="n">to_path</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)</span>
                <span class="n">extract_archive</span><span class="p">(</span><span class="n">from_path</span><span class="o">=</span><span class="n">target_dir_zip</span><span class="p">,</span> <span class="n">to_path</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="k">raise</span> <span class="ne">RuntimeError</span><span class="p">(</span><span class="s1">&#39;Dataset not found or incomplete. Please make sure all required folders for the&#39;</span>
                                   <span class="s1">&#39; specified &quot;split&quot; and &quot;mode&quot; are inside the &quot;root&quot; directory&#39;</span><span class="p">)</span>

        <span class="k">for</span> <span class="n">city</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">listdir</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">images_dir</span><span class="p">):</span>
            <span class="n">img_dir</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">images_dir</span><span class="p">,</span> <span class="n">city</span><span class="p">)</span>
            <span class="n">target_dir</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">targets_dir</span><span class="p">,</span> <span class="n">city</span><span class="p">)</span>
            <span class="k">for</span> <span class="n">file_name</span> <span class="ow">in</span> <span class="n">os</span><span class="o">.</span><span class="n">listdir</span><span class="p">(</span><span class="n">img_dir</span><span class="p">):</span>
                <span class="n">target_types</span> <span class="o">=</span> <span class="p">[]</span>
                <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">target_type</span><span class="p">:</span>
                    <span class="n">target_name</span> <span class="o">=</span> <span class="s1">&#39;</span><span class="si">{}</span><span class="s1">_</span><span class="si">{}</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">file_name</span><span class="o">.</span><span class="n">split</span><span class="p">(</span><span class="s1">&#39;_leftImg8bit&#39;</span><span class="p">)[</span><span class="mi">0</span><span class="p">],</span>
                                                 <span class="bp">self</span><span class="o">.</span><span class="n">_get_target_suffix</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">mode</span><span class="p">,</span> <span class="n">t</span><span class="p">))</span>
                    <span class="n">target_types</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">target_dir</span><span class="p">,</span> <span class="n">target_name</span><span class="p">))</span>

                <span class="bp">self</span><span class="o">.</span><span class="n">images</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">img_dir</span><span class="p">,</span> <span class="n">file_name</span><span class="p">))</span>
                <span class="bp">self</span><span class="o">.</span><span class="n">targets</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">target_types</span><span class="p">)</span>

<div class="viewcode-block" id="Cityscapes.__getitem__"><a class="viewcode-back" href="../../../datasets.html#torchvision.datasets.Cityscapes.__getitem__">[docs]</a>    <span class="k">def</span> <span class="fm">__getitem__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">index</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        Args:</span>
<span class="sd">            index (int): Index</span>
<span class="sd">        Returns:</span>
<span class="sd">            tuple: (image, target) where target is a tuple of all target types if target_type is a list with more</span>
<span class="sd">            than one item. Otherwise target is a json object if target_type=&quot;polygon&quot;, else the image segmentation.</span>
<span class="sd">        &quot;&quot;&quot;</span>

        <span class="n">image</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">images</span><span class="p">[</span><span class="n">index</span><span class="p">])</span><span class="o">.</span><span class="n">convert</span><span class="p">(</span><span class="s1">&#39;RGB&#39;</span><span class="p">)</span>

        <span class="n">targets</span> <span class="o">=</span> <span class="p">[]</span>
        <span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">t</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">target_type</span><span class="p">):</span>
            <span class="k">if</span> <span class="n">t</span> <span class="o">==</span> <span class="s1">&#39;polygon&#39;</span><span class="p">:</span>
                <span class="n">target</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_load_json</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">targets</span><span class="p">[</span><span class="n">index</span><span class="p">][</span><span class="n">i</span><span class="p">])</span>
            <span class="k">else</span><span class="p">:</span>
                <span class="n">target</span> <span class="o">=</span> <span class="n">Image</span><span class="o">.</span><span class="n">open</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">targets</span><span class="p">[</span><span class="n">index</span><span class="p">][</span><span class="n">i</span><span class="p">])</span>

            <span class="n">targets</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">target</span><span class="p">)</span>

        <span class="n">target</span> <span class="o">=</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">targets</span><span class="p">)</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">targets</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">1</span> <span class="k">else</span> <span class="n">targets</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>

        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">transforms</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
            <span class="n">image</span><span class="p">,</span> <span class="n">target</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">transforms</span><span class="p">(</span><span class="n">image</span><span class="p">,</span> <span class="n">target</span><span class="p">)</span>

        <span class="k">return</span> <span class="n">image</span><span class="p">,</span> <span class="n">target</span></div>

    <span class="k">def</span> <span class="fm">__len__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="k">return</span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">images</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">extra_repr</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
        <span class="n">lines</span> <span class="o">=</span> <span class="p">[</span><span class="s2">&quot;Split: </span><span class="si">{split}</span><span class="s2">&quot;</span><span class="p">,</span> <span class="s2">&quot;Mode: </span><span class="si">{mode}</span><span class="s2">&quot;</span><span class="p">,</span> <span class="s2">&quot;Type: </span><span class="si">{target_type}</span><span class="s2">&quot;</span><span class="p">]</span>
        <span class="k">return</span> <span class="s1">&#39;</span><span class="se">\n</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">lines</span><span class="p">)</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="o">**</span><span class="bp">self</span><span class="o">.</span><span class="vm">__dict__</span><span class="p">)</span>

    <span class="k">def</span> <span class="nf">_load_json</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">path</span><span class="p">):</span>
        <span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">path</span><span class="p">,</span> <span class="s1">&#39;r&#39;</span><span class="p">)</span> <span class="k">as</span> <span class="n">file</span><span class="p">:</span>
            <span class="n">data</span> <span class="o">=</span> <span class="n">json</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="n">file</span><span class="p">)</span>
        <span class="k">return</span> <span class="n">data</span>

    <span class="k">def</span> <span class="nf">_get_target_suffix</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">mode</span><span class="p">,</span> <span class="n">target_type</span><span class="p">):</span>
        <span class="k">if</span> <span class="n">target_type</span> <span class="o">==</span> <span class="s1">&#39;instance&#39;</span><span class="p">:</span>
            <span class="k">return</span> <span class="s1">&#39;</span><span class="si">{}</span><span class="s1">_instanceIds.png&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">mode</span><span class="p">)</span>
        <span class="k">elif</span> <span class="n">target_type</span> <span class="o">==</span> <span class="s1">&#39;semantic&#39;</span><span class="p">:</span>
            <span class="k">return</span> <span class="s1">&#39;</span><span class="si">{}</span><span class="s1">_labelIds.png&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">mode</span><span class="p">)</span>
        <span class="k">elif</span> <span class="n">target_type</span> <span class="o">==</span> <span class="s1">&#39;color&#39;</span><span class="p">:</span>
            <span class="k">return</span> <span class="s1">&#39;</span><span class="si">{}</span><span class="s1">_color.png&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">mode</span><span class="p">)</span>
        <span class="k">else</span><span class="p">:</span>
            <span class="k">return</span> <span class="s1">&#39;</span><span class="si">{}</span><span class="s1">_polygons.json&#39;</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">mode</span><span class="p">)</span></div>
</pre></div>

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